Question

Why are there so little usable materials left to historians to use?

Answer 1

Answer:

There are little usable materials left for historians to use as either they are already used or have depleted over time. With time, many historians have carried out various studies and have already used the available historical resources, thereby leaving no room for others.

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Answer 2

Explanation:

There are little usable materials left for historians to use as either they are already used or have depleted over time. ... With time, many historians have carried out various studies and have already used the available historical resources, thereby leaving no room for others

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